Blank-holder toggle-movement for drawing-presses.



l. PATRICK. BLANK HOLDER TOGGLE MOVEMENT FOR DRAWING PRESSES.

. APPLICATION FILED DEC- ll. I917. 1,28%286. Pa sented 00 1918.

3 SHEETS- I.

PATRICK. BLANK HOLDER TOGGLE MOVEMENT FOR DRAWING PRESSES.

Patented Oct. 1, 1918.

SSHEETS-SHEEIZ ms NuRms mrrsns co.. moraurmz. wAsmNomN. vi 'a V l. PATRICK.

BLANK HOLDER TDGG LE MOVEMENT FOR DRAWING PRESSES.

$1,286,2 6. Patented 001;.1, 1918.

3 SHEETSSHEET 3.

APPLICATION FILED DEC. 11, 1917.

W afiffor neys pi s Penna chip.

ISAAC PATRICK, 01? HASTINGS, MICHIGAN, ASSIGNOR TO CONSOLIDATED PRESS GOMPANYZ-OF HASTINGS, MICHIGAN, CORPORATION OF MICHIGAN.

BLANK-HOLDER TOGG-LE-IVIOVEMENT FOR DRAWING-PRESSES.

menses.

To all whom it may concern:

Be itknown that I, ISAAC PATRICK, a subject of the King of Great Britain, having taken out my first papers for naturalization as a citizen of the United States, and residin at Hastings, in the county of Barry and gtate of Michigan, have invented certain new and useful Improvements in Blank- Holder Toggle-Movements for Drawing Presses; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to, the accompanying drawings, which form part of this specification. V

This invention is a novel improvement in so-called toggle-drawing-presses and has particular reference to that class of machines in which a blank-holder is employed to hold the work while the same is being operated upon. 7 p

The present invention particularly relates to the mechanism for operating the blankholder, and I will firstexplain the same with reference to the. accompanying drawings, which illustrate one. practical embodiment of the invention, and then summarize in the claims the essential features and combination of parts for which I desire protection.

In saiddrawings:

Figure 1 is a conventional side elevation of one type. of toggle drawin press, equipped with my novel blank-hol er operating devices. 7 l r Fig. 2 is a front view of Fig. 1.

.Fig..3.is an enlarged diagrammatical sectional elevation of the blank-holder operating-means, showingthe positions of the parts near the ends of the downward strokes of the blank-holder and plunger.

Fig. A is a similar view showing the position of said parts during the upward movement ofthe blank-holder and plunger; the blank-holder being almost fully raised, and the plunger raised about half way.

Fig; 5 is an enlarged vertical sectional view on the line 55,' Fig. 1.

The machine indicated in Figs. 1 and 2 is a sO called double-acting toggle-drawing press; the particular. construction of such;

main crank shaft T, which main shaft may Specification of Letters Patent.

Patented Uct. 1, 1918.

Application filed December 11, 1917. Serial No. 206,640.

be operated in the usual manner by suitable gearing which it is not necessary to show or describe in detail.

A blank-holder A, of a well known type, is shown surrounding the plunger B and suspended by adjustable bolts D from yokes C, which yokes are connected, at the opposite sides of the machine, by pairs of links E, E to arms F, F on rock shafts S, S, which shafts are j ournaled insuitable bearings on the sides of the main frame of the press and near the top thereofin the usual manner.

, At one side of the machine the shafts S and S are provided with crank arms G, G, to which arms areconnected toggle links H, H that in turn are pivotally connected together at 0; this pivot 0 being attached to a lever J, which is pivotally connected at one end to a crank K on the adjacent end of the main shaft T, crank K being so disposed relatively to the crank t that the blank-holder will be actuated at the proper time and in the desired relation to the movement of the plunger B.

The lever J extends beyond the pivotal connection (J of the links H, H thereto and its free end, opposite its connection to the crank it, is engaged with a guiding cam member N. This cam member is preferably a fixed race cam, and it is engaged by a roller M on the end of lever J as indicated in the drawings. The roller M is securely fastened to the free end of lever J butis free to move around the cam member N.

As the shaft is rotated the lever J will be oscillated by the crank and the roller M will traverse the race way in cam mem ber N and so guide the upper end of the lever J as to keep the pivot O in the desired relation to the shafts S, S, at all times.

Operation.

The main shaft T is operated bysuitable gearing in the usual manner so as to reciprocate the plunger B. As the shaft T revolves the lever J, being attached at one end to crank K, moves with said crank, but the movement of the upper or free end of said lever is controlled by the engagement of roller M with the cam.N. This cam isso shaped that the path traversed by the roller M has such relation to the path of the pivot connecting lever J to crank K that the fulcrumhpoint O, or connection between the links H and H, Will travel in an approximately vertical line, or perpendicular to the shaft T andintermediate theshafts S, S.

Cain member N insures that" proper and desired unifor n and equal rocking move ments Will be imparted from the crank K throughlever J and links H, H to the shafts S, S; The roller M prevents any deflection of the pivot or fulcrum point O fronithe desired line of movement hich it should traverse during the operation of the blank helder, andinsures a straight line of travel of the pivot v a By this means theblank-hold'er is raised and lowered in correct relation to the plunger B, sdthatthe blank-holder will be lowel 'e'd to engage and hold the Work just before the'plunger begins" to operate thereupon; willfholdthe Work while the plunger tegiasa Withdrawtherefroin-; and Will then raise and releasethe Work.

In the example-shown the blank-holder dwells during a period of not less than 90 degrees "Whilecra'nlr' K is passing over the top center of the cam member, and thetog gl'e" formed by the blank-holder connections will dwell on the drawing stroke until the crankshaft T has passed through an arc of 90 degrees.

WhatI claini is:

1. In'a drawing press having a plungen'a cranlfshaft and 4 connections for operating the plunger, a blank-holder; a pair of rock shafts and operative connections between the rock-shaft and the blank-holder; a crankfa lever connected Withjsaid crank, a"'can1 engagingthe lever for guidin same; and I links conii'ectingthe lever with arms on the rock-slfaftsfl v 2:"I1ia'draWing press having a main shaft a plunger, means for operating'tlie plunger fierriuemaia shaft,ablank holder, a pair of'ro'ck-fshafts and links connecting arins on said shafts With the blanlholder; a "crank on the main shaft, a lever 'coniiectechwith crank'g a can'i controlling theknoveinent of the free "end of the lever, and links" connectitig this lever Witherins on the rock sh'a'ftl i y 3;Ii1' a {qrawing res having a crank shaft," a plunger and connections for operating the plunger fro n the crank shaft, a pair ofrock-shafts, and links connecting arms oil f tlfe-'rock-shaft with the blank h'o'lder a crank on themain shaft,"a"1ever coiirieted with i said crank, it fixed jcaiiieiigaging the free end "of-th' levertonguidiiig sainegaiid links" connecting arms on the rock-shaft with' saidle'veri 4c. "In a toggle drawing press theconibination ofa; mam -plul'i ger and means for order at'ing same; aiida blank-holder," with a and having its other end niovablv engaged with said ca'ni ineinber, links connected with said lever intermediate the crank and "the cam, and arms on said rock-shaft connected with said links. I V

6, In a toggledrawing press the conibina tion ota main plunger, a main shaft; and means for operating" the lunger ifron'i said shaft, a blank holdei, a pair of rock sliafts', arms on the rock-shafts, links"coniiecting such arms with the blank hdlder a "crank on the main shaft, a fiiied" caiii nieinbei," a lever pivotallyconnected to said? crank at one end and having its other end niovablv engaged With said can'i "member and links connected with said lever intermediate the crank and the cam and with arms on said rock-shaft, substantiallyas de'scribedi 7. In drawing press liaviiig I a inaiif lunger; meane rmepeating the "plunger, and a blank-holder rocltslia'ftsj arins on the"rockshaft's with theblank holdei ga ro tatable cran'k'; a lever connected With' this crank and oscillated thereby; a cam con trolling the movement o'fthe lever;' and links "conn cted with this lever at 'a po'int intermediate as (mes-and with; arms on" tile roc'l'r shafts, said cain' causing the pena of connection of the link with the lever to rn'ove; in a straight-linens "thebraiik rotates 8. In 'a toggle drawing press the: coinbi nation ofainain plunger; meansfer oper-f ating same; a blank holderfia rotatable crank a fixed cam: a lever having one fend pivotally connected with the crank and its other end'movably-engageu' with "said 'cain; blanlehoider operatingmeans; 1 and ma neetionsbetween' a point on said. -leve'i inter: mediate the ends" thereof and the time holder operating means; said *caifl causing the point of connectfi onfofth' link with the lever to move in straight- 1meas-theater rotates.

my ow-n, I Y time"megawatt; 1

Isaac PATRIGK? 

